US9719663B2 - Illuminating device and projector - Google Patents

Illuminating device and projector Download PDF

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US9719663B2
US9719663B2 US14/381,607 US201314381607A US9719663B2 US 9719663 B2 US9719663 B2 US 9719663B2 US 201314381607 A US201314381607 A US 201314381607A US 9719663 B2 US9719663 B2 US 9719663B2
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light
illuminating device
light pipe
reflector
wavelength
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US20150043242A1 (en
Inventor
Yi Ding
Ulrich Hartwig
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Coretronic Corp
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Osram GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/08—Combinations of only two kinds of elements the elements being filters or photoluminescent elements and reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/08—Optical design with elliptical curvature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2101/00—Point-like light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular sheet or layer

Definitions

  • Various embodiments relate to an illuminating device and a projector.
  • the laser light source for example, laser diode (LD)
  • LD laser diode
  • the LD illuminating device is used in various environments (e.g. medical devices, automobile headlamps, night vision monitoring, stage illumination and the like).
  • the LD illuminating device has a longer illumination distance and a longer service lifetime.
  • such LD illuminating device usually includes a laser diode array configured to generate laser beams; collimating lenses respectively corresponding to the laser diodes of the laser diode array and configured to collimate laser beams emitted from corresponding laser diodes; compression optics configured to reduce intervals between parallel laser beams emitted from respective collimating lenses; and a focus lens configured to converge light emitted from the compression optics.
  • the collimating lenses can collimate the laser beams into parallel light, and then the parallel light is focused on a desired location after compressed and converged, as shown in FIG. 1 .
  • FIG. 1 the collimating lenses can collimate the laser beams into parallel light, and then the parallel light is focused on a desired location after compressed and converged
  • Various embodiments provide an illuminating device, with which the low light efficiency problem of the above illuminating device can be solved, and light beams having a desirable wavelength can be obtained.
  • the illuminating device may include a light source, an optical unit configured to adjust direction of light from the light source and a reflector, characterized in that the illuminating device further includes a light pipe and an exciter, the light pipe receives light having a first wavelength from the optical unit and projects the light having the first wavelength onto the exciter, the exciter converts the light having the first wavelength into light having the second wavelength and reflects the light having the second wavelength to the reflector, wherein circumferential wall of the light pipe is configured to reflect the light having the first wavelength and to transmit the light having the second wavelength.
  • Various embodiments may improve the illuminating device by additionally providing a light pipe, whose circumferential wall is configured to reflect the light having the first wavelength and to transmit the light having the second wavelength.
  • Various embodiments propose the light pipe, whose circumferential wall is configured to reflect the light having the first wavelength and to transmit the light having the second wavelength, other than a normal light pipe that reflects light having all wavelengths.
  • the yellow light beams is reflected and scattered by the exciter, and the reflected and scattered yellow light is incident to the inner side of the light pipe and is also reflected by the light pipe, so that the yellow light finally leaves the reflector at one end of the reflector that receives the blue laser, thus the whole illuminating device could not work.
  • Various embodiments propose the light pipe whose circumferential wall has dichromaticity, so that for example the yellow light beams will be directly transmitted through the circumferential wall without influence on the operate of the illuminating device.
  • the light pipe can solve the problems of the illuminating device that the light utilization efficiency is reduced as the focus light spot is expanded or deviated from a desired location caused by tolerance in practical manufacturing and decentering and tiling in assembling of the collimating lenses, and thus, an allowable tolerance of the collimating lenses of the illuminating device is increased, and light having a desirable wavelength can be provided according to requirements.
  • the light pipe is tapered.
  • the light pipe is tapered with a certain conical degree
  • one end of the light pipe having a relatively larger size is preferably used to receive light from the optical unit, thus a accepting area for receiving converged light beams can be increased, so that the focus light spot still can enter the light pipe even in a situation that the focus light spot is deviated from the focus position a certain distance or the focus light spot is expanded, and thus, the allowable deviation of the collimating lenses of the illuminating device can be improved.
  • an inner side of the circumferential wall of the light pipe is coated with a dichromic coating, or the circumferential wall of the light pipe is a dichromic mirror.
  • the dichromic coating includes, for instance, hydrophilic polymer film of a dichromic pigment, e.g., PVA film, locally formalized PVA film and ethylene-vinyl acetate copolymer local saponification film.
  • the dichromic mirror can be any of the known dichromic mirrors which are applicable.
  • the reflector is an ellipse reflector.
  • the ellipse reflector is capable of reflecting light from a first focus thereof to a second focus thereof so that converged light beams can be obtained at the second focus of the ellipse reflector.
  • the illuminating light beams can have a small divergence angle so that the light efficiency of the illuminating device can be improved.
  • the reflector is a reflector with an opening, and the opening is configured in such a manner that the light pipe is at least partially inserted into the reflector through the opening.
  • the light pipe and the reflector can be assembled by at least partially inserting the light pipe into the reflector so as to reduce the volume of the illuminating device.
  • the advantage of the designation of the present disclosure is more apparent especially in a way that an exit end of the light pipe configured to reflect the light having the first wavelength and to transmit the light having the second wavelength is provided in the reflector.
  • the light pipe may include a first end and a second end, wherein the second end has a size smaller than that of the first end, and the light pipe is at least partially inserted into the ellipse reflector by the second end.
  • the light having the first wavelength is collectedly emitted from the light pipe by at least partially inserting the second end of the light pipe into the ellipse reflector.
  • an optical axis of the light pipe passes through the focus of the reflector.
  • the exciter is provided in the first focus position of the ellipse reflector, so as to enable light reflected from the exciter onto the ellipse reflector to be focused on the second focus position of the ellipse reflector, thereby forming collect beams.
  • a distance between the exciter and the second end of the light pipe preferably is 0.5 mm-1.0 mm so that more uniform and more light can illuminate upon the exciter and the exciter is prevented from being quenched by the laser light beams, and the light efficiency of the illuminating device is improved.
  • the light pipe is preferably 20 mm, whereby light enters the light pipe and will be reflected and superposed several times in the light pipe to enable light emitted from the light pipe to have a uniform luminance distribution, so that the exciter can be further prevented from being quenched, and the service lifetime of the exciter thereby is prolonged, and the light efficiency of the illuminating device is further improved.
  • the optical unit may include collimating lenses, compression optics and a focus lens provided in sequence on light path.
  • the optical unit configured in such a manner can adjust light beams emitted from the light source to have a relatively small light spot, so that the light efficiency of the illuminating device is improved.
  • the ellipse reflector is a hollow ellipse reflector.
  • the light pipe is at least partially inserted into the hollow ellipse reflector through an opening of the hollow ellipse reflector, so that the illuminating device becomes compact and miniaturized.
  • a reflective layer is coated on an end surface of the second end of the light pipe.
  • the reflective layer coated on the end surface can reflect that part of light beams incident upon the end surface, thus preventing TIR phenomenon of that part of light beams incident upon the end surface within the circumferential wall of the light pipe, and that part of light beams can be re-utilized.
  • that part of light beams incident upon the end surface includes light having the first wavelength and light having the second wavelength. In a situation that the light having the first wavelength is reflected, the conversion efficiency of the exciter can be improved; and in a situation that the light having the second wavelength is reflected, the light collecting efficiency of the reflector can be improved. Therefore, the light efficiency of the illuminating device can be further improved on the whole.
  • the reflective layer can be a normal reflective film of visible light wavelength.
  • the ellipse reflector may include a first portion and a second portion, wherein the first portion and the second portion are assembled with each other to define a cavity for inserting the light pipe. Assembling the two portions to define the cavity for inserting the light pipe also can miniaturize the illuminating device. Moreover, another advantage of such configuration is easy processing and manufacturing.
  • inner surfaces and outer surfaces of the first portion and the second portion are configured to reflect the light having the second wavelength and to transmit the light having the first wavelength.
  • the light pipe has a length of 20 mm so as to realize uniform light distribution as light is reflected and superposed several times in the light pipe.
  • the dimension of the light pipe depends upon several factors, for instance, a half width R at entrance of the light pipe is determined by tolerance of the device, and values generally taken should allow an assembling error of 0.1 mm of the collimating lenses; a half width r at an exit of the light pipe is determined by taking efficiency of the exciter, quenching and aperture size at the second focus of the ellipse reflector into consideration, wherein the aperture size at the second focus of the ellipse reflector is determined according to practical requirements; the length of the light pipe depends upon the dimension of the ellipse reflector, while the latter is decided as demanded by the device.
  • the light pipe has quadrangular truncated cone, and the light pipe includes four wall portions assembled together, and the wall portions jointly form the circumferential wall of the light pipe.
  • the light spot emitted from the illuminating device can have a quadrilateral shape and thus can be used in a system that needs quadrilateral light beams, e.g. for illuminating a digital micromirror device (DMD) in a DLP projector.
  • DMD digital micromirror device
  • the light pipe is a circular truncated cone, and the light pipe includes two semicylindrical wall portions assembled together, and the wall portions jointly form the circumferential wall of the light pipe.
  • the light spot emitted from the illuminating device can have a circular shape, and thus the illuminating device can be used in an environment that needs circular light beams.
  • the exciter may include a plurality of regions, each of which has the different excitation properties, that is, is excited by the light having the first wavelength to generate excited light of different color, including, e.g. red light, blue light, green light, yellow light. Therefore, the wavelength of light beams emitted from the illuminating device can be adjusted.
  • the exciter is a phosphor.
  • the phosphor can be red phosphor made from a YBO 3 :Eu material, green phosphor made from a ZnSiO 4 :Mn material, blue phosphor made from a barium magnesium aluminate material doped with Eu 2+ ions, and yellow phosphor made from YAG.
  • Various embodiments further provide a projector, including the illuminating device above, and light emitted from said illuminating device can directly enter another light pipe of the projector and then projects onto a digital micromirror device. Since light reflected by the reflector can be focused at the second focus location, the light efficiency can be improved.
  • exciter refers to such a substance which is illuminated by incident light having a certain wavelength (ultraviolet radiation or visible light) and absorbs photo energy to be in excited state, and then transits into ground state or low excited state to emit light having different wavelength from that of the incident light.
  • the representation substance of exciter is the emitting material which uses the rare earth compound as ground substance and rare earth elements as exciting agent, includes but is not limited to phosphor.
  • the problem of low light efficiency of the above illuminating device can be solved, and light beams having a desirable wavelength can be obtained.
  • FIG. 1 and FIG. 2 show prior illuminating devices, wherein light paths in an ideal situation and in an actual situation are shown, respectively;
  • FIG. 3 is a schematic diagram of a first embodiment of an illuminating device according to the present disclosure
  • FIG. 4 is a schematic diagram of light paths in a light pipe and in a reflector shown in FIG. 3 ;
  • FIG. 5 is a schematic diagram of a second embodiment of an illuminating device according to the present disclosure.
  • FIG. 6 shows a total internal reflection (TIR) effect generated within a circumferential wall of the light pipe
  • FIG. 7 is a schematic diagram of a third embodiment of an illuminating device according to the present invention for eliminating the total internal reflection effect as shown in FIG. 6 ;
  • FIG. 8 is a schematic diagram of a fourth embodiment of an illuminating device according to the present disclosure.
  • FIG. 9 is a schematic diagram of a method for manufacturing the light pipe of the illuminating device of the first to the fourth embodiments of the present disclosure.
  • FIG. 10 is a schematic diagram of light deviation caused by wall thickness of the light pipe.
  • FIG. 11 is a diagram showing relation between light deviation and incident angle.
  • FIG. 3 is a schematic diagram of a first embodiment of an illuminating device 10 according to the present disclosure.
  • the illuminating device 10 includes a light source 1 , a plurality of collimating lenses 2 , compression optics 3 , a focus lens 4 , a tapered light pipe 5 , a phosphor 6 and an ellipse reflector 7 with an opening 70 , wherein the light source 1 is a laser diode array including a plurality of laser diodes and emits, for instance, blue laser; the plurality of collimating lenses 2 are corresponding to the plurality of laser diodes of the light source 1 , respectively, and configured to collimate blue laser from corresponding laser diode into parallel light; the compression optics 3 is configured to reduce intervals between parallel blue laser beams emitted from respective collimating lenses 2 ; the focus lens 4 is configured to converge the blue laser beams emitted from the compression optics 3 ; the tapered light pipe 5 is configured to receive the blue laser beams
  • the ellipse reflector 7 is configured to reflect the yellow light beams reflected by the phosphor 6 to a second focus position (e.g. F 2 ).
  • the tapered light pipe 5 is partially inserted into the ellipse reflector 7 , and an optical axis of light in the tapered light pipe 5 passes through the first focus position (F 1 ) of the ellipse reflector 7 where the phosphor 6 is located and can be perpendicular to or form a certain angle with the phosphor 6 located at the focus F 1 .
  • a circumferential wall of the tapered light pipe 5 is configured to reflect blue light beams and to transmit the yellow light beams, as shown in FIG. 4 , wherein solid lines L 1 represent light paths of the blue light beams in the tapered light pipe 5 , and broken lines L 2 represent light paths of the yellow light beams.
  • the blue laser emitted from the collimating lens 2 is not parallel light, thus a light spot emitted from the focus lens 4 will be caused to be deviated and expanded (as shown in FIG. 2 ).
  • a accepting area of the converged laser beams is increased, so that the deviated light spot and expanded light spot also can be received, and as a result, the light efficiency of the illuminating device is improved.
  • FIG. 4 is the schematic diagram showing light paths in the tapered light pipe 5 and in the ellipse reflector 7 , the blue laser beams (solid lines L 1 ) going into the tapered light pipe 5 are reflected and superposed several times in the tapered light pipe 5 , and then exit from the tapered light pipe 5 onto the phosphor 6 .
  • the blue laser beams striking on the phosphor 6 are converted by the phosphor 6 into yellow light beams (broken lines L 2 ), and the yellow light beams are scattered and reflected by the phosphor 6 onto the ellipse reflector 7 , and then the ellipse reflector 7 reflects the yellow light beams L 2 to the second focus position F 2 of the ellipse reflector 7 and exit from the focus F 2 .
  • the laser beams projecting from the tapered light pipe 5 onto the phosphor 6 are in a uniform distribution, and thus the phosphor 6 quenching by the laser beams can be prevented.
  • a maximum illuminance on a focus plane is 99 W/mm 2 when the laser beams enter the light pipe, and 10.6 W/mm 2 when the laser beams exit from the light pipe.
  • the illuminating device 10 is thus enabled to be compact and miniaturized. Specifically, when the tapered light pipe 5 has a length of about 20 mm and it is not inserted into the ellipse reflector 7 , a total length of the illuminating device including other optical system for imaging on the phosphor 6 is longer than 100 mm, and when the tapered light pipe 5 is inserted into the ellipse reflector 7 , the illuminating device 10 can become more compact.
  • FIG. 5 is a schematic diagram of a second embodiment of an illuminating device according to the present disclosure.
  • the second embodiment of the illuminating device 100 of the present disclosure is different from the first embodiment of the illuminating device 10 according to the present disclosure in that in the second embodiment, the tapered light pipe 5 is completely inserted into the ellipse reflector 7 , such that the illuminating device 100 is further allowed to be compact and miniaturized.
  • FIG. 6 shows a total internal reflection (TIR) effect generated within the circumferential wall of the light pipe.
  • TIR total internal reflection
  • inventors of the present disclosure propose to coat a reflective layer on the end surface of the lower end of the light pipe 5 , so that the yellow light beams incident upon the end surface are reflected back to the phosphor 6 instead of entering the circumferential wall of the light pipe 5 , and the yellow light beams reflected back to the phosphor 6 are again reflected by the phosphor 6 to arrive at the ellipse reflector 7 , as shown in FIG. 7 .
  • FIG. 7 is a schematic diagram of a third embodiment of an illuminating device according to the present disclosure for eliminating the total internal reflection effect as shown in FIG. 6 .
  • the third embodiment of the illuminating device of the present disclosure is different from the second embodiment of the illuminating device 100 of the present disclosure in that a reflective layer 55 is coated on the end surface of the lower end of the light pipe 5 .
  • the reflective layer 55 can be a normal reflective film of visible light wavelength. With such configuration, occurrence of TIR effect can be avoided, and thus, this part of light still can be re-utilized, and the light efficiency of the illuminating device can be improved.
  • FIG. 8 is a schematic diagram of a fourth embodiment of an illuminating device 200 according to the present disclosure.
  • the fourth embodiment of the illuminating device 200 of the present disclosure is different from the second embodiment of illuminating device 100 of the present disclosure in that in the fourth embodiment, the ellipse reflector 7 includes a first glass block 7 . 1 and a second glass block 7 . 2 , and the first glass block 7 . 1 and the second glass block 7 . 2 are assembled with each other by, for instance, bonding through glue or mechanical fitment, to define a cavity for inserting the light pipe 5 .
  • inner surfaces and outer surfaces of the first glass block 7 . 1 and the second glass block 7 are assembled with each other by, for instance, bonding through glue or mechanical fitment, to define a cavity for inserting the light pipe 5 .
  • inner surfaces and outer surfaces of the first glass block 7 . 1 and the second glass block 7 are assembled with each other by, for instance, bonding through glue or mechanical fitment, to define a cavity for inserting
  • the blue laser beams transmit through the ellipse reflector 7 made of glass blocks to enter the tapered light pipe 5 , and exit after reflected several times within the tapered light pipe 5 .
  • the blue laser beams exited from the tapered light pipe 5 are projected onto the phosphor 6 , the blue laser beams projected on the phosphor 6 are converted by the phosphor 6 into yellow light beams, the yellow light beams are reflected by the phosphor 6 to the ellipse reflector 7 , and then the yellow light beams are reflected by the ellipse reflector 7 onto the second focus position F 2 of the ellipse reflector 7 and exit from the focus F 2 .
  • the same effect as that of the second embodiment of the illuminating device according to the present disclosure can be realized.
  • the TIR phenomenon (as shown in FIG.
  • the ellipse reflector 7 is made of glass blocks that can again reflect back that part of yellow light beams and the blue light beams reflected and scattered from the phosphor 6 to the phosphor 6 , and thus, this part of blue light beams and yellow light beams can be re-utilized, which also can achieve the effect of improving the light efficiency of the illuminating device.
  • a better light collection efficiency also can be obtained at the second focus F 2 of the ellipse reflector 7 by modifying and optimizing a curved surface of the ellipse reflector 7 , thereby, the efficiency of the illuminating device is further improved.
  • the blue laser beams and the yellow light beams are taken as examples in the first to fourth embodiments, that is, the blue laser diode array is used as the light source 1 , and the yellow phosphor is used as the phosphor 6 , the present disclosure is not limited to the above.
  • the blue laser light beams and the yellow light beams also can be light of other colors, for example, the red laser diode array and the green laser diode array can be used as the light source 1 so that the red laser beams and the green laser beams can be instead of the blue laser beams, also the blue phosphor, the red phosphor or the green phosphor can be used as the phosphor 6 so that the blue light, the red light or the green light can be emitted instead of the yellow light, which can be changed according to practical requirements, and the configuration of light pipe can be adjusted accordingly.
  • the ellipse reflector is taken as an example for description, the present disclosure is not limited to the same, and reflectors having other configurations, e.g. aspherical reflector and parabolic reflector, can be used.
  • the illuminating device can be used for stage illumination, searchlight, etc.
  • FIG. 9 is a schematic diagram of a method for manufacturing the light pipe of the illuminating device of the first to the fourth embodiments of the present disclosure. As shown in FIG. 9 , a schematic diagram of a method for manufacturing the light pipe is given by taking a quadrangular truncated cone light pipe as an example.
  • a quadrangular truncated cone solid rod 50 having a dimension substantially the same as that of the cavity of the light pipe is prepared, and then, four pieces of dichromic mirrors 51 are adhered to four sidewalls of the quadrilateral tapered solid rod by using an adhesive such as glue, so that the four dichromic mirrors 51 are assembled together, and thereafter, the quadrangular truncated cone solid rod 50 is removed so as to manufacture a quadrangular truncated cone light pipe 5 .
  • the light pipe of the present disclosure can be manufactured by using the manufacturing method as shown in FIG. 9 after four glass sheets are coated with a dichromic coating through an existing coating process.
  • a circular truncated cone light pipe can be formed by plating a dichromic coating on two semicylindrical glass sheets through an existing coating process and using a method similar to the manufacturing method as shown in FIG. 9 .
  • FIG. 10 is a schematic diagram of light deviation caused by wall thickness of the light pipe. As shown in FIG. 10 , when light beams reflected from the phosphor are incident upon an inner wall of the light pipe, the light beams will be deviated to a certain degree when emerging from an outer wall of the light pipe due to influence of refraction. As shown in FIG. 10
  • the phosphor in the above embodiments of the present disclosure can be made into a wheel shape and includes a plurality of regions each of which generates light having a different wavelength upon excitation, e.g. blue light, red light, green light and yellow light.
  • the plurality of regions are the blue phosphor, the red phosphor and the green phosphor, respectively, so that the blue light, the red light and the green light can be emitted from the illuminating device.
  • the illuminating device having such configuration can be used in a DLP projector.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US14/381,607 2012-04-01 2013-03-26 Illuminating device and projector Active 2034-04-27 US9719663B2 (en)

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CN103365051A (zh) 2013-10-23
US20150043242A1 (en) 2015-02-12

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